"blue fly" meaning in English

{
  "forms": [
    {
      "form": "blue flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue fly (plural blue flies)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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          "source": "w"
        },
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          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Oestroid flies",
          "orig": "en:Oestroid flies",
          "parents": [
            "Dipterans",
            "Insects",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1665, Robert Hooke, Micrographica, section XLII:",
          "text": "Out of the upper part of the trunck grew the two wings […]: these in a blue Fly, were much longer then the body, but in other kind of Flies they are of very differing proportions to the body.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A blue dipteran fly, especially the bluebottle, Calliphora vomitoria."
      ],
      "id": "en-blue_fly-en-noun-SzVSye4J",
      "links": [
        [
          "dipteran",
          "dipteran"
        ],
        [
          "fly",
          "fly"
        ],
        [
          "bluebottle",
          "bluebottle"
        ]
      ]
    }
  ],
  "word": "blue fly"
}

{
  "forms": [
    {
      "form": "blue flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue fly (plural blue flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "Entries using missing taxonomic name (species)",
        "Pages with 1 entry",
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        "Quotation templates to be cleaned",
        "en:Oestroid flies"
      ],
      "examples": [
        {
          "ref": "1665, Robert Hooke, Micrographica, section XLII:",
          "text": "Out of the upper part of the trunck grew the two wings […]: these in a blue Fly, were much longer then the body, but in other kind of Flies they are of very differing proportions to the body.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A blue dipteran fly, especially the bluebottle, Calliphora vomitoria."
      ],
      "links": [
        [
          "dipteran",
          "dipteran"
        ],
        [
          "fly",
          "fly"
        ],
        [
          "bluebottle",
          "bluebottle"
        ]
      ]
    }
  ],
  "word": "blue fly"
}